ci: Use codecov-action v4 (#972) #6226

Job	Run time
tests 3.8 / ubuntu-latest	36s
Get Docker tags from file	6s
tests 3.9 / ubuntu-latest	48s
Type checking (3.8)	50s
tests 3.10 / ubuntu-latest	31s
Type checking (3.9)	41s
tests 3.11 / ubuntu-latest	40s
Type checking (3.10)	51s
tests 3.12 / ubuntu-latest	1m 25s
Type checking (3.11)	50s
tests pypy3.9 / ubuntu-latest	1m 0s
Type checking (3.12)	50s
tests pypy3.10 / ubuntu-latest	1m 17s
xdoctest 3.11 / ubuntu-latest	39s
tests 3.13 / ubuntu-latest	1m 12s
tests 3.11 / windows-latest	1m 36s
tests 3.11 / macos-latest	56s
integration 3.11 / 6-apache / postgres	2m 0s
integration 3.11 / 6.2.4-230825-apache / postgres	2m 16s
integration 3.11 / 5-apache / postgres	2m 2s
integration 3.11 / 5.6.35-230822-apache / postgres	1m 58s
integration 3.11 / 6.2.3-230821-apache / postgres	2m 11s
integration 3.11 / 5.6.34-230816-apache / postgres	1m 55s
integration 3.11 / 6.2.2-230814-apache / postgres	2m 26s
integration 3.11 / 5.6.33-230808-apache / postgres	2m 2s
integration 3.11 / 6-apache / mysql	2m 15s
integration pypy3.9 / 6-apache / postgres	2m 22s
integration 3.11 / refs/heads/5.x / postgres	4m 48s
integration 3.11 / refs/heads/develop / postgres	4m 10s
integration 3.11 / refs/heads/master / postgres	4m 43s
Coverage (unit)	40s
Coverage (integration)	33s
	51m 9s

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